FIRST

Section: User Commands (1)
Updated: Fri Dec 2 1994
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NAME

first - YagiUda project quick antenna builder

SYNOPSIS

first filename elements f_min f_design f_max f_step diameter

DESCRIPTION

The program first is one of a number of executable programs that forms part of a set of programs, collectively known as the Yagi-Uda project , which were designed for analysis and optimisation of YagiUda antennas. first is used to define an antenna quickly, if you are not interested in analysing a specific design (in which case use input ) but need to get a design that is half-way reasonable so that it may be optimised. It is much faster in use (since its not interactive) than input The design methodology that first is the DL6WU antenna designs, which are valid for 10 or more elements, although first will calculte for any number of elements. DL6WU reccomends a folded dipole, but the designs here are for a simple dipole, since I dont yet know how to calculate the self and mutual impednaces of folded dipoles.

LIMITATIONS

Filenames, including full path, can't exceed 90 characters.

Does not take into account the varaition of impedance of a dipole with change in wavelength/diamter of elements.

FILES

filename          Yagi description, created by first.
filename.out      Binary data file, created by yagi.
filename.dat      Perfomance of antenna, created by output.
filename.gai      Gain of antenna, created by output.

AVAILABILITY

Most of the source files were written by me (David Kirkby, G8WRB) and are distributed for amateur (non-commercial use only). If you wish to use the programs for commercial use, you will have to negotiate with me first on this matter. You can not sell the source files, or any program containing them. You can not use the program for any commercial bussiness, including the amateur radio business. You can charge the cost of the media (floppy disk etc) when passing the programs onto a third party. You must give them a copy of the file LICENCE. You must not edit the LICENCE file. You must give them all the rights you have, by giving them a copy of the LICENCE file and if they request it, the sources (less those mentioned in the next paragraph).

A small number of files are basically hacked versions of programs printed in the book Numerical Recipes in C, by Press et al, Cambridge University Press, 1992. I have permission to distribute an executable containing the routines, but not the source. You should not have been given the source to these routines free. They are copyright and sold commercially.

The executable programs, must not be used commercailly, as you will be breaking this licence and the conditions imposed by Cambridge University Press on the distrubution of the executable. To use an executable commercailly, you will have to:
(1) Negotiate with me for the majority of the sources.
(2) Negotiote with Cambridge University Press for permission to used the sources from the book Numerical Recipes in C.

David Kirkby (G8WRB),
Stokes Hall Lodge,
Burnham Raod,
Althorne,
Essex,
CM3 6DT.

The DOS .EXE files as distributed require a 387 maths coprocessor to be present and will not run without it. A 486, Pentium, and I assume later processors of this series will run it without any extra hardware.

PLATFORMS

Both DOS and and Unix versions have been built. The DOS vesion as distributed requires a 386 PC with a 387 maths coprocessor.

AUTHORS

Dave Kirkby G8WRB (davek@medphys.ucl.ac.uk). with help with the conversion to the DOS/PC enviroment from Joe Mack NA3T (mack@fcrfv2.ncifcrf.gov)

BUGS

Bugs should be reported to: David Kirkby G8WRB (davek@medphys.ucl.ac.uk). Bugs tend actually to be fixed if they can be isolated, so it is in your interest to report them in such a way that they can be easily reproduced.

If the input file is edited manually and done incorrectly, there can be unpredictable results.

Options are not checked for sensible numbers. A negative length can be entered!

This document was created by man2html, using the manual pages.
Time: 04:01:47 GMT, January 18, 2023